"Anthony, George, and Lucy investigate new hauntings, track down assassins, and a new assistant joins Lockwood & Co"--

"With the help of some unexpected, and rather ghostly, allies, Lockwood & Co. must battle their greatest enemy yet, as they move ever closer to the moment when the earth-shattering secret of 'the problem' will finally be revealed."

Follows three young operatives of a Psychic Detection Agency as they battle an epidemic of ghosts in London.

"Lockwood & Co. are hired to investigate Edmund Bickerstaff, a Victorian doctor who reportedly tried to communicate with the dead, while Lucy is distracted by urgent whispers coming from the skull in a ghost jar"--

"Albert and Scarlett are a formidable pair. With his ability to read minds and her way with a weapon, no bank can keep them out and no jail can keep them in. But their notoriety may have spread a bit too far. Now old enemies from Scarlett's past and a sinister new threat from Albert's world are boxing them in--and holding their friends hostage. To win their freedom, the outlaws Scarlett and Browne are charged with pulling off an impossible mission....